09 JULY 2019 Flashcards
ch. 17 basically
list the seven s/s of basal ganglia disorders:
- akinesia
- rigidity
- postural imbalance
- freezing
- mask-like facial expression
- visuoperceptual impairment
- resting tremor
difference between cerebellar tremor and BG tremor:
cerebellar tremor = acting tremor so whenever you move you have oscillations
BG tremor = resting tremor
what is the difference reason of a cerebellar tremor?
when the cerebellum is dyfxal you can’t coordinate movement
why do you have mask-like facial expressions w/ BG dysfx
because impariment of the CN 7: facial N
hyperkinetic means that
there is in an increase output from the cortical spinal
a hyperkinetic disorder is
huntington’s disease
a hypokinetic disorder is
parkinson’s disease
def of huntington’s dx
degeneration of cerebral cortex & stratium = BG
what happens to the thalamus w/ huntington’s dx:
too much input so too much voluntary movement
what happens to the PPN w/ huntington’s dx:
decrease input for the postural girdle muscle
huntingtons vs parkinson’s
exact opposite
except huntington’s we dont’ know about the midbrain
soooooo:
parkinsons’
decrease thalamus input: decrease voluntary movement
increase PPN: so increase postural girdle movements
decrease mid brain: so stop walking pattern generator
huntington’s
increase thalamus so increase voluntary movements
decrease PPN: so decrease postural girls movements
midbrain idk
motor thalamus tract go:
motor thalamus - motor cortex - corticospinal tract - Mms of involuntary movement
the motor thalamus is
excitatory
the PPN is
inhibitory
the midbrain is
excitatory
name the two excitatory structures:
motor thalams
midbrain locomotor
name the inhibitory structures:
PPN
how do we thereapeutically stop the freezing of gait?
we think of something else
- do not think of walking
- think of dancing or stepping over lazer beam
feedforward def:
I anticipate lost of blaance adn prepare motor movement to stop
= self incitated movement
= system of fx
feedback def:
recoverying after something has knocked you off balance
name the three sensory influences:
- vision
- vestibular
- somatosensation
two things vision does:
sees the horizon
and movement
two things the vestibular does
head movement
pull of gravity
two things somatosensation does:
supports surface
body position
